Toyota CH-R Service Manual: Blind Spot Monitor Sensor Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Blind Spot Monitor Sensor Communication Stop Mode	Any of the following conditions are met: Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Blind Spot Monitor Master" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "Blind Spot Monitor Sensor Communication Stop Mode" in "DTC Combination Table" are output. Click here	Blind spot monitor sensor LH branch line or connector Power source circuit of blind spot monitor sensor LH Blind spot monitor sensor LH ground circuit Blind spot monitor sensor LH

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 12 seconds or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	CHECK FOR OPEN IN CAN BUS LINES (BLIND SPOT MONITOR SENSOR LH BRANCH LINE)

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the blind spot monitor sensor LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M62-2 (CA1P) - M62-7 (CA1N)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M62-10 (BLGD) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH)

(b) Reconnect the cable to the negative (-) battery terminal.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
M62-5 (BLB) - Body ground	Ignition switch ON	11 to 14 V

REPLACE BLIND SPOT MONITOR SENSOR LH

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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Toyota C-HR (AX20) 2023-2026 Owner's Manual